Source : Webster's Revised Unabridged Dictionary (1913)

Repay \Re*pay"\ (r?-p?"), v. t. [imp. & p. p. {Repaid} (-p?d");
   p. pr. & vb. n. {Repaying}.] [Pref. re- + pay: cf. F.
   repayer.]
   1. To pay back; to refund; as, to repay money borrowed or
      advanced.

            If you repay me not on such a day, In such a place,
            such sum or sums.                     --Shak.

   2. To make return or requital for; to recompense; -- in a
      good or bad sense; as, to repay kindness; to repay an
      injury.

            Benefits which can not be repaid . . . are not
            commonly found to increase affection. --Rambler.

   3. To pay anew, or a second time, as a debt.

   Syn: To refund; restore; return; recompense; compensate;
        remunerate; satisfy; reimburse; requite.

Source : WordNet®

repay
     v 1: pay back; "Please refund me my money" [syn: {refund}, {return},
           {give back}]
     2: make repayment for or return something [syn: {requite}]
     3: act or give recompensation in recognition of someone's
        behavior or actions [syn: {reward}, {pay back}]
     4: answer back [syn: {retort}, {come back}, {return}, {riposte},
         {rejoin}]
     [also: {repaid}]